Perhaps he was riding a little on MU inexperience, and now that the other top players have figured out their way to deal with pika, he just needs to adopt counterplay.
Either way, pika feels really hot and cold to play. Sometimes you get in easy, convert it for kills frequently, and just feel unstoppable... but sometimes you feel like you're fighting a literal wall, kills don't come until u-throw does it, and you feel totally limited.
I don't think its the end for ESAM's pikachu, and we'll probably see another breakout performance at some point, even if it is just because people forget about pika while he is an amazing player. But, I think it is healthy for him to be using a secondary, even if it just gives him more perspective on his favorite character.
Or, he busts out Samus (his OG fav character and Melee main, by the way) and starts stomping faces now that she is buffed and Zero is in hiding learning Bayonetta behind everyone's back.
Also, Cloud seems more beatable every day to me. Bayonetta, I don't see as much as Cloud TBH, and maybe its just me but I don't mind the defensive stance you need to beat her.
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Also, someone said M2 doesn't like Bayonetta, and I see some reasoning for this (she can actually edgeguard him, Witch Time guarantees a really really early kill, she can do all kinds of extra stuff on him because he is huge, uair confirms demolish him early)... but I think he has some advantages that cannot be understated in the matchup either.
He has a really great, killing projectile. This can be a reactive punish if the bayonetta has accrued some lag, and tries to divekick to safety. It gives him something to use in neutral to force her towards him, and allows him to adopt a defensive style against her that he likes. He has quick, powerful hitboxes that can semi-zone her (fair), but aren't the slow juggernaut's that can easily be Witch Timed. His slowest aerial (by FAF) is nair, and this can outright beat Witch Time if done correctly. He gets confirms on people easily, which kill Bayonetta really really early. He has 2 amazing kill throws, which can make Bayonetta regret doing anything. SHAD -> Aerial is great for punishing divekicks, if you time it perfectly, since you don't simply bounce to safety. While he can be edgeguarded, he also can bypass playing the ledge game at all in certain situations. Finally, being lightweight isn't so much a concern when she is killing you from a stray hit at random % anyways, you just want to not get hit... and m2 has the best airdodge (behind hers) and some powerful disjoints (that we didn't even see abadango using to their fullest, except uair and utilt)... I just don't think its bad at all.
And if he also does decent against cloud (better camping, good edgeguarding, good shield game, throws you offstage in both directions... plays at the ledge well) then M2 was set up for success not by the slight patches, but by a meta shifting far into his favor.
Also... anyone hate Pit as m2? Elec is great at plowing thru safe fairs, the disjoint is annoyingly better than ours, and arrows are frustrating when you try and charge or set yourself up to recover and can ruin M2's extremely important double jump. Also, only fresh shadow ball can win a ping pong battle vs reflector.
Speaking of which, we didn't see much ping ponging from Aba as I'd like, since I believe that is one of m2's best assets. Of course, this was also because his opponents didn't reflect much, or simply didn't have reflectors... which is better to lob shadowballs at.
As people learn the math more, M2 might be making everyone approach. He certainly hurts when he spaces you.